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a deep water well

magnetism2772
Grafter
Posts: 983
Registered: 06-06-2010

a deep water well

First some definitions
Quote
The definition of a horsepower unit is different in different applications application outside of the context of a particular definition will be inaccurate. One mechanical horsepower of 550 foot-pounds per second is equivalent to 745.7 watts. A metric horsepower of 75 kgf-m per second is equivalent to 735.499 watts. A boiler horsepower is used for rating steam boilers and is equivalent to 34.5 pounds of water evaporated per hour at 212 degrees Fahrenheit, or 9809.5 watts. One horsepower for rating electric motors is equal to 746 watts .A Pferdestarke is a name for a group of similar power measurements used in Germany around the end of the 19th century, all of about one metric horsepower in size. An ALAM or SAE horsepower is not a unit of power but instead is a measure of internal combustion engine displacement, and an RAC horsepower or tax horsepower is a differently defined unit of displacement.


We have all all seen camels  being used to raise water from a deep well
can anyone say why  and what sort of effort is needed ?
in a  more specific problem(NO I'm not going to pump oil , only not discovered a well yet)
BUT
If I needed to lift 99 gallons of water every minute from a deep well that was 40 foot below ground
does anyone know the minimum HP pump rating (the pump working efficiency is 75%) I would need to carry out the job?
28 REPLIES
Community Veteran
Posts: 16,834
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Registered: 06-11-2007

Re: a deep water well

I don`t  Grin
Edit.....
But I know a man who does ! ! ! ..(see below)_  Cheesy
pierre_pierre
Grafter
Posts: 19,757
Registered: 30-07-2007

Re: a deep water well

first problem
Weight of 1 US Gallon of water = approx. 8.35 lb
Weight of 1 imperial gallon (eg UK measure) of water weighs 10 pounds by definition, at a specified temperature and pressure.
so you have to lift 990 pounds 40 ft per min, that is 39600 ft pounds per min or 660 ft pounds sec or 1.2 HP or  at  75% 1.6HP
magnetism2772
Grafter
Posts: 983
Registered: 06-06-2010

Re: a deep water well

Your ~ right pierre
I'm looking at this problem in another way
1 Water Horse Power(Horse Power)of power on a water wheel is equivalent
to the water wheel being placed  40 foot vertically below a head of water
which is flowing at a rate of 99 gallons every minute onto it
what comes down must go up
so to pump the same amount of water through the same distance
then 1HP = 1WHP (water horse power)
and because the pump is said to be 75%(effective)  
then rated HP of my water pump = 1 times 75/100= 1.34 WHP  = 1.34 mechanical Horse Power or
converting it  to watts in case the water pump is an electric motor = ~1KW
if the motor was stated in Metric Horse Power
then I would need to convert HP into Metric HP
or metric HP * 100 / 98.6  = Mechanical HP
then  1.34 Mechanical Horsepower = 1.3585853516681599 Metric Horsepower
so yes I think your calculations are  right
pierre_pierre
Grafter
Posts: 19,757
Registered: 30-07-2007

Re: a deep water well

and dont forget the pump has to be at the bottom, you cant suck up 40 foot
pierre_pierre
Grafter
Posts: 19,757
Registered: 30-07-2007

Re: a deep water well

Well I have got an old HNC in fluids and thermo dynamics
magnetism2772
Grafter
Posts: 983
Registered: 06-06-2010

Re: a deep water well

well done
Community Veteran
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Registered: 15-06-2007

Re: a deep water well

Quote from: pierre_pierre
Well I have got an old HNC in fluids and thermo dynamics
A proper one then before they downgraded it  Grin
magnetism2772
Grafter
Posts: 983
Registered: 06-06-2010

Re: a deep water well

posting edits - see below
magnetism2772
Grafter
Posts: 983
Registered: 06-06-2010

Re: a deep water well

so here is a formula
HP = gpm times Head(H) in feet
Head(H)in feet  = HP/gpm
gpm = HP/Head(H) in feet
where HP  = mechanical Horse Power
Head(feet) = Vertical Height of falling water in feet
gpm  = flow of falling water in gallons per minute  
pierre_pierre
Grafter
Posts: 19,757
Registered: 30-07-2007

Re: a deep water well

first year, Mathematics, Material and Machines, Thermodynamics and Fluids
Second Year, Strength of Material, Theory of Machines, Appled Thermodynamis,
Night School completed 1965  said it was old
and I try not to twaddle about the facts
magnetism2772
Grafter
Posts: 983
Registered: 06-06-2010

Re: a deep water well

little bit before my time
so its no wonder my workings are so different  Cheesy
Community Veteran
Posts: 38,246
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Registered: 15-06-2007

Re: a deep water well

Nearly as old as my mechanical engineering degree - 1963  Embarrassed
magnetism2772
Grafter
Posts: 983
Registered: 06-06-2010

Re: a deep water well

both 1960's students then
a few guys from those times come to mind , tony benn , and the beatles etc
very  well done
pierre_pierre
Grafter
Posts: 19,757
Registered: 30-07-2007

Re: a deep water well

Oh and I did most of my working life in secret Vehicle research, as per my recent old photos of Prototype vehicles, now finished production